Blink cameras use AA lithium batteries that are 1.5 volts and non-rechargeable. While alkaline batteries can also be used, they may not provide the same level of performance and may need to be replaced more frequently. It is not recommended to use rechargeable batteries as they have lower voltage than lithium batteries, which can cause the camera to malfunction. It is important to note that using non-lithium batteries may void the warranty on the Blink camera. The battery life of Blink cameras is about two years on average. Blink cameras have a battery status indicator that shows a low battery warning when the batteries are running low.